Test Blast

July 1, 1985

STOCKHOLM, SWEDEN — An underground nuclear explosion in the Soviet Union set off tremors recorded in Sweden early Sunday, the seismological department of Uppsala University said. The blast took place at the Semipalatinsk nuclear testing site in eastern Khazakstan, seismologist Torild van Eck said. The energy released had a magnitude of 6.7 on the Richter scale, he said. An earthquake hitting 6 on the Richter scale can cause severe damage, and a reading of 7 would be equivalent to a major earthquake. There were no reports of damage in Sweden.